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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfa15d367afc85f050cd6e5076d680695796a6a5d139e4e28a61e54bb667330' 
  AND token = 'rQvK0y+gpFi5AN+Oa1gGMSMXMv2akrnIBK41n4WTWFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}